Fix the picture orientation that iOS gets from cameras and albums

Fix the picture orientation that iOS gets from cameras and albums

The default direction of images taken with the system camera is sometimes not imageorientationdown, but Imageorientationleft, which appears when used in a clockwise deflection of 90 °. Use the Fixorientation method to fix the problem.

- (UIImage *) fixorientation{No-op If the orientation is already correctif (Self.imageorientation = =Uiimageorientationup)ReturnSelfWe need to calculate the proper transformation to make the image upright.We do it on 2 steps:rotate if Left/right/down, and then flip if mirrored.Cgaffinetransform transform =cgaffinetransformidentity;Switch (Self.imageorientation) {CaseUiimageorientationdown:CaseUiimageorientationdownmirrored:transform =Cgaffinetransformtranslate (Transform,Self.size.width,Self.size.height); Transform =Cgaffinetransformrotate (transform, M_PI);BreakCaseUiimageorientationleft:CaseUiimageorientationleftmirrored:transform =Cgaffinetransformtranslate (Transform,Self.size.width,0); Transform =Cgaffinetransformrotate (transform, m_pi_2);BreakCaseUiimageorientationright:CaseUiimageorientationrightmirrored:transform =Cgaffinetransformtranslate (Transform,0,Self.size.height); Transform =Cgaffinetransformrotate (transform,-m_pi_2);BreakDefaultBreak }Switch (Self.imageorientation) {CaseUiimageorientationupmirrored:CaseUiimageorientationdownmirrored:transform =Cgaffinetransformtranslate (Transform,Self.size.width,0); Transform =Cgaffinetransformscale (Transform,-1,1);BreakCaseUiimageorientationleftmirrored:CaseUiimageorientationrightmirrored:transform =Cgaffinetransformtranslate (Transform,Self.size.height,0); Transform =Cgaffinetransformscale (Transform,-1,1);BreakDefaultBreak }Now we draw the underlying cgimage into a new context, applying the transformCalculated above.Cgcontextref CTX =Cgbitmapcontextcreate (NullSelf.size.width,Self.size.height,Cgimagegetbitspercomponent (Self. Cgimage),0,Cgimagegetcolorspace (Self. Cgimage),Cgimagegetbitmapinfo (Self. Cgimage));CGCONTEXTCONCATCTM (CTX, transform);Switch (Self.imageorientation) {CaseUiimageorientationleft:CaseUiimageorientationleftmirrored:CaseUiimageorientationright:CaseUiimageorientationrightmirrored:Grr ...Cgcontextdrawimage (CTX,CGRectMake (0,0,Self.size.height,Self.size.width),Self. Cgimage);break; default: cgcontextdrawimage (CTX, cgrectmake (0,0,self.size.width,self.size.height", self. Cgimage); break;} //and now we just create a new UIImage from the drawing context CG Imageref cgimg = cgbitmapcontextcreateimage (CTX); uiimage *img = [uiimage Imagewith cgimage:cgimg]; cgcontextrelease (CTX); cgimagerelease (cgimg); return img;}            

Fix the orientation of the pictures that iOS gets from the camera and album